I have yet to find a hard shell eyeglass case with a hinge that doesn’t fail in short order.
No matter how careful you are with opening and closing the case, with daily use the hinge of every hard shell eyeglass case I have ever used will suddenly fail after less than a year of use, and the eyeglass case will no longer stay closed.
Why doesn’t anyone make a spring-loaded eyeglass case hinge that lasts?
If it is impossible to manufacture a durable spring-loaded hinge, then perhaps a magnetic closure should also be added to the case.